Assessment in special cases.

In the case of any guardian, trustee or agent of any minor or other incapacitated person carrying on business on behalf of and for the benefit of such minor or other incapacitated person, the tax shall be levied upon and recoverable from such guardian, trustee or agent as the case may be, in the like manner and to the same extent as it would be leviable on, and recoverable from, any such minor or other incapacitated person, if he were of full age and sound mind and if he were conducting the business himself and all the provisions of this Act and rules made thereunder shall apply accordingly